Cohn, a dedicated free marketeer, was regarded by many financiers and commerce chiefs as an important moderating influence on Trump’s business policy.

Until last year Cohn was chief operating officer at bank Goldman Sachs. His former boss and head of the bank, Lloyd Blankfein, was quick to tweet that he was sure he joined “many others who are disappointed to see him leave".

It seems it is not just US investors who feel unsettled by losing their their man in the administration.